The Combined Risk Index is calculated by normalizing the values of the following columns:
Each column is normalized to a range between 0 and 1, where 0 represents the lowest risk and 1 represents the highest risk. The Combined Risk Index is the average of these normalized values.
Note that for the normalization:
In the Pacific context, these variables are crucial due to their direct impact on communities' vulnerability to natural disasters, accessibility, and overall resilience:
High risk sites are classified as follows:
The percentage of high-risk sites is calculated as the number of high-risk sites divided by the total number of sites.
| Province | Mean Rainfall in Driest Quarter (mm) | Median Rainfall in Driest Quarter (mm) | Std Dev Rainfall in Driest Quarter (mm) | Mean Height above Sea Level (m) | Median Height above Sea Level (m) | Std Dev Height above Sea Level (m) | Mean Height above Drainage Network (m) | Median Height above Drainage Network (m) | Std Dev Height above Drainage Network (m) | High Risk Sites (Rainfall) | High Risk Sites (Height above Sea Level) | High Risk Sites (Height above Drainage Network) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Rennell and Bellona | 501 | 500 | 21 | 18 | 13 | 19 | 6 | 5 | 5 | 18 (100%) | 6 (33%) | 16 (88%) |
| Temotu | 978 | 972 | 16 | 13 | 11 | 15 | 10 | 8 | 8 | 0 (0%) | 24 (44%) | 30 (55%) |
| Western | 726 | 734 | 69 | 15 | 10 | 17 | 13 | 10 | 16 | 114 (73%) | 73 (47%) | 77 (49%) |
| Malaita | 638 | 640 | 23 | 62 | 14 | 126 | 28 | 9 | 50 | 301 (87%) | 121 (35%) | 173 (50%) |
| Makira-Ulawa | 709 | 718 | 43 | 17 | 11 | 23 | 13 | 8 | 18 | 108 (90%) | 53 (44%) | 71 (59%) |
| Guadalcanal | 358 | 340 | 58 | 36 | 12 | 73 | 14 | 7 | 29 | 165 (98%) | 70 (41%) | 100 (59%) |
| Isabel | 538 | 525 | 45 | 35 | 11 | 91 | 18 | 7 | 40 | 102 (99%) | 46 (44%) | 64 (62%) |
| Honiara | 289 | 288 | 2 | 23 | 18 | 18 | 12 | 11 | 10 | 47 (100%) | 11 (23%) | 22 (46%) |
| Choiseul | 734 | 738 | 28 | 9 | 7 | 9 | 8 | 6 | 8 | 85 (91%) | 62 (66%) | 67 (72%) |
| Central | 347 | 347 | 1 | 10 | 7 | 9 | 10 | 7 | 9 | 3 (100%) | 2 (66%) | 2 (66%) |
| National | 595 | 635 | 159 | 35 | 12 | 84 | 18 | 8 | 35 | 943 (85%) | 468 (42%) | 622 (56%) |